I think this can alleviate the abortion for rape victims that everyone pulls out of their "examples" of why abortion should be kept legal. But let's be honest, this isn't going to stop abortions. This only works seriously the next day - after that it just makes you sick (is my understanding).
If you can't avoid getting pregnant in the first place - in all liklihood you're not going to go the next morning to the drug store to get this over the counter medicine.